Finding the Fourth Proportional to 123,311.13, 170,172.78 and 74,896.71

Step by Step Solution

1. Step 1: Write the proportion equation
   123,311.13 : 170,172.78 = 74,896.71 : x
2. Step 2: Convert to fraction form
   123,311.13/170,172.78 = 74,896.71/x
3. Step 3: Cross multiply
   123,311.13x = 170,172.78 × 74,896.71
4. Step 4: Simplify right side
   123,311.13x = 12,745,381,353.55
5. Step 5: Solve for x
   x = 12,745,381,353.55/123,311.13
6. Step 6: Final answer
   x = 103,359.54